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The idle speed screw sets the throttle butterfly to control the airflow through the carburetor to set the idle engine speed. We recommend idling the carburetor around 1200 RPMs
The Idle Speed Screw fits most Clone Carburetors including the Tillotson PK-1, Hyuai, Ruixing, and SP Carburetors on the Honda GX200, Ducar 196, Ducar/Tillotson 212E, Tillotson 196R/RS, Tillotson 212R, Ducar/Tillotson 212E, Predator 212, and BSP 196 and 212 Engines.